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Mesora as a technical term generally refers to mesoretic text of the torah, the mesoret.
I presume the writer is referring to the oral law as discussed in the Talmud. For reasons that are not clear, the Oral and Written law as summarized in the Shulchan Aruch has become the authoritive summary of the halacha for all Jews. (After a hundred years of fierce debate.) Now people who come up with things not in the Shulchan Aruch or wish to hold like the minority opinion in the Shulchan Aruch are people making Chumras. Since many of the technological inovations we use today are from after the time of the Shulchan Aruch, anything we add in their regard is a chumra, i.e., outlawing the use of light bulbs or electricity on Shabbat in general is a chumra. In the case of sakanah, this is a debate from the time of the Rambam and Tosephot when they realized the medicine and folklore of the babylonian talmud could really be considered superstition (they were a very superstitious lot) and therefore do not have the force of the halacha. This debate has little to do with modern chumras which is a matter of making assur that which our sainted forefathers and those before them held to be permitted.
Thank you Razel! I think you gave an excellent insight.
As far as Shabbos is concerned... Shabbos is different...
Again, Ron, what did you mean by mesora?
On Shabbos we can say we are not as concerned with the natural process of digestion.
So to say that in general eating meat with fish is unhealthy for health reasons...
maybe on Shabbos we are not as concerned.
Although we don't eat them mamosh together, perhaps the health issue is still illuminated.
The intention of not eating meat and fish together is a health guideline.